How do I make string-based calculations?

[ratty]

I have no idea what I'm missing. I know I've done calculations in the past based off strings but for whatever reason it wont work now. What I'm trying to accomplish is essentially taking a typed out string from an edit box an calculating the answer.

Example:
I type "(2+2)3" into a text box, then press a key and the box changes to "12".

[tompa]

maybe conversions?

Str$()
Val()

[crayzorechos]

Hi ratty! This is pretty easy! For your example:

global int_ResultStringCalculation=( Val(Mid$(Global String A, 1, 1 ) ) + Val(Mid$(Global String A, 3, 1 ) ) ) * Val(Mid$(Global String A, 6, 1 ) )

If you need, that user can be change action by number, you can write hardness code for this!

[Gustav]

You can find the extension Expression Evaluator (or ExpEval Object) in the Extension Manager.
It has an expression to evaluate formulas: Evaluate$( "ExpEval Object", "(2+2)*3" )